A failure sign detection device (9) for an X-ray diagnostic device (1) correlates and acquires the orientation angle of a rotating-positive-electrode X-ray tube (10) measured by a motion sensor (22) and vibration data of the rotating-positive-electrode X-ray tube (10) measured by a vibration sensor (21), and detects a sign of failure of the rotating-positive-electrode X-ray tube (10) on the basis of the amount of time-dependent change in the vibration data since the start of use of the rotating-positive-electrode X-ray tube (10) for each of a plurality of orientation angles.
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